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Schedule of right of use assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Right of use assets, beginning $ 13 $ 20
Increase 7 3
Reclasification to assets clasified as held (10)
Right of use assets, ending 20 13
Right of use assets depreciation, beginning (3) (4)
Depreciation (5) (5)
Reclasification to assets clasified as held 6
[custom:AccumulatedDepreciationRightOfUseAssets-2] (8) (3)
Net book values 12 10
Machinery [member]    
IfrsStatementLineItems [Line Items]    
Right of use assets, beginning 13  
Increase 7  
Reclasification to assets clasified as held  
Right of use assets, ending 20 13
Right of use assets depreciation, beginning (3)  
Depreciation (5)  
Reclasification to assets clasified as held  
[custom:AccumulatedDepreciationRightOfUseAssets-2] (8) (3)
Net book values $ 12 $ 10